Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang tai » hang tai, tang tai, sang tai
nang mai » nang ma, lang mai, nang cai
sach ly » sach y, sach lo, sach ty
va cham » va chat, va tham
cu tren » tu tren, dua tren
cuu va » cuu ve
vi cu » vi su, vi xu, vi du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly ((nang mai) OR (nang tai)) hoi. lieu va cham ((cuu va) or (cuu van)) hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly ((nang mai) OR (nang tai)) hoi. lieu va cham ((cuu va) OR (cuu van)) hanh vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly ((nang mai) OR (nang tai)) hoi. lieu va cham ((cuu va) or (cuu van)) hanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ly ((nang mai) OR (nang tai)) hoi. lieu va cham ((cuu va) or (cuu van)) hanh vi cu tren*.